Rietveld analysis of the powder X-ray diffraction of a new layered oxyarsenide, LaNiOAs, which was synthesized by solid-state reactions, revealed that LaNiOAs belongs to the tetragonal ZrCuSiAs-type structure (P4/nmm) and is composed of alternating stacks of La-O and Ni-As layers. The electrical and magnetic measurements demonstrated that LaNiOAs exhibits a superconducting transition at 2.4 K, and above this, LaNiOAs shows metallic conduction and Pauli paramagnetism. The diamagnetic susceptibility measured at 1.8 K corresponded to ~20% of perfect diamagnetic susceptibility, substantiating that LaNiOAs is a bulk superconductor.
Cite
@article{arxiv.0805.4340,
title = {Nickel-based layered superconductor, LaNiOAs},
author = {Takumi Watanabe and Hiroshi Yanagi and Yoichi Kamihara and Toshio Kamiya and Masahiro Hirano and Hideo Hosono},
journal= {arXiv preprint arXiv:0805.4340},
year = {2008}
}
Comments
11 pages, 4 figures, Journal of Solid State Chemistry, in press. Received 18 March 2008. Accepted 29 April 2008. Available online 8 May 2008